Run results for: Reflect.deleteProperty vs delete

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

delete - 0 property

19.5M/s

delete - 1 property

13.3M/s

delete - * property

11.3M/s

Reflect.deleteProperty - 0 property

8.5M/s

Reflect.deleteProperty - 1 property

7.0M/s

Reflect.deleteProperty - * property

6.5M/s

View exact numbers

Test name	Executions per second
✓ delete - 0 property	19,505,038 Ops/sec
delete - 1 property	13,291,524 Ops/sec
delete - * property	11,287,572 Ops/sec
Reflect.deleteProperty - 0 property	8,461,836 Ops/sec
Reflect.deleteProperty - 1 property	7,036,517 Ops/sec
Reflect.deleteProperty - * property	6,515,685 Ops/sec

Script Preparation code:

var many = {}
for (let i = 0; i < 100000; i++) many[i] = i

Tests:

delete - 1 property
var obj = { a: 1 } delete obj.a
Reflect.deleteProperty - 1 property
var obj = { a: 1 } Reflect.deleteProperty(obj, 'a')
delete - * property
delete many[50000] many[50000] = 50000
Reflect.deleteProperty - * property
Reflect.deleteProperty(many, 50000) many[50000] = 50000
delete - 0 property
delete many['x']
Reflect.deleteProperty - 0 property
Reflect.deleteProperty(many, 'x')